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Wiring, Electrical & Installation
Battery Isolator Question
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<blockquote data-quote="digitboy123" data-source="post: 8534553" data-attributes="member: 671632"><p>I've since spoken to another technician who was able to describe the operation, and was even able to give an acceptable (I think) way to accomplish what I'm looking for.</p><p></p><p>Normally, an auxiliary battery is installed to power external accessories connected directly to it (i.e., not through the vehicle's standard wiring). Placing an isolator between the batteries (rather than wiring them in parallel) is what 'isolates" them and prevents draining both batteries with the external accessories. However, accessories inside the vehicle on the existing wiring will still get power from the main battery. And rewiring internal vehicle components to power from the auxiliary battery would be a great deal of work.</p><p></p><p>The other feature of the invertor is to regulate the charging phase so that the second battery only gets charged once the main battery is fully charged.</p><p></p><p>In my case however, I'm not looking to add any external accessories. I want to use accessories inside the vehicle using the existing wiring while the engine is off, and still be confident I can start it afterward.</p><p></p><p>So a way to accomplish this would be to first wire the the isolator as usual. I would use the inside accessories with the engine off and they would receive power as normal, from the main battery. Now, the isolators have an "override" connector (usually a yellow wire or post). Connecting the override connector to the (+)auxiliary battery effectively removes the isolator from the circuit, putting the batteries in parallel. Placing a switch on the connection allows you to temporarily control this action. With the switch off, it will attempt to start from the main battery. With the switch on, it will have the cranking power of the two batteries combined.</p><p></p><p>So, turn the switch on, start the engine, then turn the switch off once the engine is started. Don't forget! This would defeat the whole purpose of the setup. Perhaps even get in the habit of starting the engine this way all the time.</p><p></p><p>Installing one wire and one switch on a low amperage (</p><p></p><p>Brilliant, I think. Thanks to Matt at Powerstream. <a href="http://www.powerstream.com" target="_blank">Injection molding, Batteries, Battery Chargers, Custom UPS, and power supplies for OEMs in a hurry from PowerStream</a></p></blockquote><p></p>
[QUOTE="digitboy123, post: 8534553, member: 671632"] I've since spoken to another technician who was able to describe the operation, and was even able to give an acceptable (I think) way to accomplish what I'm looking for. Normally, an auxiliary battery is installed to power external accessories connected directly to it (i.e., not through the vehicle's standard wiring). Placing an isolator between the batteries (rather than wiring them in parallel) is what 'isolates" them and prevents draining both batteries with the external accessories. However, accessories inside the vehicle on the existing wiring will still get power from the main battery. And rewiring internal vehicle components to power from the auxiliary battery would be a great deal of work. The other feature of the invertor is to regulate the charging phase so that the second battery only gets charged once the main battery is fully charged. In my case however, I'm not looking to add any external accessories. I want to use accessories inside the vehicle using the existing wiring while the engine is off, and still be confident I can start it afterward. So a way to accomplish this would be to first wire the the isolator as usual. I would use the inside accessories with the engine off and they would receive power as normal, from the main battery. Now, the isolators have an "override" connector (usually a yellow wire or post). Connecting the override connector to the (+)auxiliary battery effectively removes the isolator from the circuit, putting the batteries in parallel. Placing a switch on the connection allows you to temporarily control this action. With the switch off, it will attempt to start from the main battery. With the switch on, it will have the cranking power of the two batteries combined. So, turn the switch on, start the engine, then turn the switch off once the engine is started. Don't forget! This would defeat the whole purpose of the setup. Perhaps even get in the habit of starting the engine this way all the time. Installing one wire and one switch on a low amperage ( Brilliant, I think. Thanks to Matt at Powerstream. [URL="http://www.powerstream.com"]Injection molding, Batteries, Battery Chargers, Custom UPS, and power supplies for OEMs in a hurry from PowerStream[/URL] [/QUOTE]
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